Improvement in making cores for castings



NrTnD STATES ?Arnnr OFFICE. i

ISAAC KELLOGG, OF NEV HARTFORD, CONNECTICUT, ASSIGNOR TO HENRY KELLOGG.

IMPROVEMENT IN MAKING CRES FOR CASTINGS.

Specification forming part of Letters Patent No. 11,483, dated April 25,1846.

To' all whom it may concern:

Be it known that I, IsAAo KELLOGG, of New Hartford, in the county of Litchfield and State of Connecticut, have invented a newwhich will insure their exact meeting together,

and then forming the parts into blunt cuttingedges atthe line where they meet together and partially closing and in that position filling the box with loose molding-sand, and then closing the box to compress the sand.

To enable others skilled in the art of molding for east-iron to make and use my invention, I will proceed to describe its construction and operation.

I construct two small frames usually of' cast iron, (though I have sometimes used wood,) suitable to be hinged together and suitable to receive and hold firmly each one-half of the core-box, and the hinge or hinges, or whatever else is used to guide and govern their movements; should be firm and good, so as to permit no irregular movement, but only that of opening and shutting, and the parts of the box so tted to each frame as always to meet each other exactly.

The accompanying drawings represent a core-box adapted to make cores for what are callec pipe-boxes, for the hubs of wagonwheels, duc.; but the same arrangement in all respects, except the particular form of the core, is equally applicable to any other similar cores. This core-box has a semi-cylindrical depression in each half, (marked o o in Figs. l and 2,) which, when closed together, form a round and smooth hole, somewhat tapered, and shaped just asthe hollow of the pipe wagon-box should be; but instead of closing the core-box and gripping it together and ramming77 it full of moistened sand, as has heretofore been done to form the core, I place the hollow of the core-box perpendicularly, as shown in Fig. 2, and set up nearly in the center a rod of iron, (which may be either solid or hollow,) and sustain it in that position with one finger, and fill the tube around it with tempered sand loosely, as it will naturally fall in, the tube of the core-box at this time being not fully closed, the edges apart about half an inch to three-quarters of an inch, (more or less, depending upon the diameter ofthe core,) and the openingsbeing temporarily closed by shutters (marked B 13,) and when the tube is thus filled with loose sand the shutters are opened or turned aside each way, as shown in Fig. l, and the core-box pressed closely together by the handles H II, compressing the core suitably, more or less, at the discretion of the Workman, as he may set the tube more y or less open when filled with loose sand, thus making the core of uniform hardness through- Yout in all parts of' it, and of such degree of hardness as is needful for strength and yet not too hard, so as to cause the casting to blow, and thus become defective. If the cores are formed on solid iron rods, it will be necessary to set one or two vent-wires by the side of the iron rod, to be drawn out after the box is closed and before it is opened toremove the finished core; but if hollow rods or tubes are used to support the cores which have small holes drilled transversely into them, as has been often practiced, then in that case the vent-wires are not needed.

` In the drawings, Fig. l, C D represent two light cast-iron frames, jointed together by a long bolt or pin, l?, to each of which a half of the core-box A, Ste., are fastened. H and H represent the handles of round wrought-iron, by which the box is opened and shut. B, 85o., represent the shutters, which are hinged to veach side of one-half of the core-box, and are shown partly opened or turned aside. The blunt or obtuse edges of the core-box are shown on both half-boxes, and two standing pins or stops (marked S S) are designed to meet the opposite frame when the box is exactly shut, to prevent the edges of the corebox injuring each other by meeting too hard together. p

In Fig. 2 the same letters indicate the same parts in different position, the boxbeing partly shut, and the shutters closed up to the sides of the box, ready to be charged with an iron rod and loose sand for a core.

The form of the frames may of course be varied in many ways by any machinist, and yet answer the same-purpose, and I consider it immaterial, except in so far as it is convenient, and it forms a strong and firm guide and iirm fastening to hold and handle the parts of the core-box so that their faces and edges shall exactly meet each other; and although I prefer joints or a hinge to any other of the usual methods of guiding the parts in opening and shutting together, yet I make no claim to these peculiarities.

My Claim as my invention, and .what I desire to secure by Letters Patent, is for- An improved core-box for making sand cores for castings, having its parts Well guided in opening and closing, and having cuttingedges at their lines of meeting, so that no -sand eau be retained between them to prevent their elosing exaetly, and fitted to be' placed partly open when loosely filled With tempered sand, which is suitably compressed by closing the core-box, and the surplus sand at the same time pared of and thrown out by the edges, and thus making the core uniformly solid or hard in all its parts and of so exact form that the hole made thereby in the easting will in many eases need no reaming,7

thus making better` cover and with greater dispatch than have usually been made by ramming up,77 so termed by melders and founders.

ISAAC KELLOGG.

Vitnesses:

JOHN B. KELLOGG, FREEMAN GRAHAM. 

